A5028968140- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Photonic Crystal and Fiber Optics
- Remote Sensing and LiDAR Applications
- Air Quality Monitoring and Forecasting
- Radiative Heat Transfer Studies
- Air Quality and Health Impacts
- Spacecraft Design and Technology
- Phase-change materials and chalcogenides
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Geophysics and Gravity Measurements
- Advanced Optical Sensing Technologies
- Solar Radiation and Photovoltaics
- Cyclone Separators and Fluid Dynamics
- Earthquake Detection and Analysis
Langley Research Center
2015-2024
Science Systems and Applications (United States)
2010-2020
Support Systems Associates (United States)
2017
Kansas State University
2006-2009
University of Illinois Urbana-Champaign
2009
Abstract. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) version 4.10 (V4) level 2 aerosol data products, released in November 2016, include substantial improvements to the subtyping and lidar ratio selection algorithms. These are described along resulting changes optical depth (AOD). most fundamental change V4 products is a new algorithm identify subtypes stratosphere. Four introduced for stratospheric aerosols: polar (PSA), volcanic ash, sulfate/other, smoke. tropospheric...
Abstract. The CALIOP lidar, carried on the CALIPSO satellite, has been acquiring global atmospheric profiles since June 2006. This dataset now offers opportunity to characterize 3-D distribution of aerosol as well seasonal and interannual variations, confront models with observations in a way that not possible before. With goal mind, monthly gridded daytime nighttime extinction constructed, available Level 3 product. Averaged for cloud-free all-sky conditions are reported separately. 6-yr...
Abstract. The Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) on board the Infrared Pathfinder Satellite Observations (CALIPSO) satellite has been making near-global height-resolved measurements of cloud and aerosol layers since mid-June 2006. Version 4.10 (V4) CALIOP data products, released in November 2016, introduces extensive upgrades to algorithms used retrieve spatial optical properties these layers, thus there are both obvious subtle differences between V4 previous releases....
Abstract. The CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) level 3 aerosol profile product reports globally gridded, quality-screened, monthly mean extinction profiles retrieved by CALIOP (the Cloud-Aerosol with Orthogonal Polarization). This paper describes the quality screening averaging methods used to generate version product. fundamental input data are 2 layer classification information (aerosol, cloud, clear-air). Prior aggregation, quality-screened a...
Abstract. The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Operations (CALIPSO) mission released version 4.1 (V4) of their lidar level 2 cloud aerosol data products in November 2016. These new were derived from the CALIPSO V4 1 data, which calibration measured backscatter at both 532 1064 nm was significantly improved. This paper describes updates to cloud–aerosol discrimination (CAD) algorithm that more accurately differentiate between clouds aerosols throughout Earth's atmosphere....
Abstract We compare the aerosol optical depths (AOD) retrieved from backscatter measurements of Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard Cloud Aerosol Infrared Pathfinder Satellite Observations (CALIPSO) satellite coincident Robotic Network (AERONET) measurements. Overpass coincidence criteria ±2 h and within a 40 km radius are satisfied at least once 149 globally distributed AERONET sites 2006 to 2010. Most data pairs (>80%) use acquired ±30 min overpass. examine...
Abstract The ability of 11 models in simulating the aerosol vertical distribution from regional to global scales, as part second phase AeroCom model intercomparison initiative (AeroCom II), is assessed and compared results first phase. evaluation performed using a monthly gridded data set extinction profiles built for this purpose CALIOP (Cloud‐Aerosol Lidar with Orthogonal Polarization) Layer Product 3.01. Results over 12 subcontinental regions show that five improved, whereas three...
Data products from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on board and Infrared Pathfinder Satellite Observations (CALIPSO) were recently updated following implementation of new (version 4) calibration algorithms for all level 1 attenuated backscatter measurements. In this work we present motivation version 4 nighttime 532 nm parallel channel calibration. The is most fundamental CALIOP data, since CALIOP's other radiometric procedures - i.e., daytime 1064 calibrations...
Abstract. The Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission released version 4.00 of their lidar level 1 data set in April 2014, subsequently updated this to 4.10 November 2016. primary difference the newly 4 (V4) is a suite calibration coefficients calculated using substantially revised algorithms. This paper describes revisions V4 daytime procedure for 532 nm parallel channel. As earlier releases, are derived by scaling raw signals calibrated...
Abstract. Radiometric calibration of space-based elastic backscatter lidars is accomplished by comparing the measured signals to theoretically expected computed for some well-characterized target. For any given system and wavelength, choice target dictated several considerations, including signal-to-noise ratio (SNR) availability. This paper describes newly implemented procedures used calibrate 1064 nm measurements acquired CALIOP (i.e., Cloud-Aerosol Lidar with Orthogonal Polarization),...
Abstract. Due to instrument sensitivities and algorithm detection limits, level 2 (L2) Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) 532 nm aerosol extinction profile retrievals are often populated retrieval fill values (RFVs), which indicate the absence of detectable levels within profile. In this study, using 4 years (2007–2008 2010–2011) CALIOP version 3 L2 data, occurrence frequency daytime profiles containing all RFVs (all-RFV profiles) is studied. data products, optical...
The Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) is an elastic backscatter lidar carried on the CALIPSO satellite. CALIOP observations between 15 and 20 April 2010 of volcanic ash plumes following eruption Icelandic Eyjafjallajökull volcano are reported here. While has limited spatial coverage due to nadir‐only sampling, were observed by over a wide region ‐ from North Atlantic Ocean eastern Europe during both day night. Due its view, however, did not sample densest which...
Abstract The new Level 3 aerosol profile data derived from the Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) provide a multiyear global distribution with high vertical resolution. We analyzed seasonal diurnal variations of distributions properties represented by 5‐year CALIPSO data. Results show that dust, smoke, polluted dust are most frequently detected types during all seasons. Dust is dominant type, especially in middle to upper troposphere, over areas...
Abstract This study validates aerosol properties retrieved using a Satellite Ocean Aerosol Retrieval (SOAR) algorithm applied to Visible Infrared Imaging Radiometer Suite (VIIRS) measurements, from Version 1 of the VIIRS Deep Blue data set. SOAR is over‐water complement over‐land and has two processing paths: globally, 95% pixels are processed with full retrieval algorithm, while 5% in shallow or turbid (mostly coastal) waters backup algorithm. Robotic Network (AERONET) used validate compare...
Abstract. In August 2018, the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) project released a new level 3 stratospheric aerosol profile data product derived from nearly 12 years of measurements acquired by spaceborne with Orthogonal Polarization (CALIOP). This monthly averaged, gridded is based on version 4 CALIOP 1B 2 products, which feature significantly improved calibration that now makes it possible to reliably retrieve profiles extinction backscatter...
There have been many proposed processes by which clouds modify aerosol properties, suggesting that properties near are different than far from clouds. We provide the first satellite‐based lidar observations of backscatter and color ratio, quantities directly related to as a function distance cloud edge for boundary layer over western tropical Atlantic. show ratio enhanced adjacent edge, particularly top base. Specifically, integrated median increases 31 ± 3% 42 2%, at wavelengths 532 nm,...
Abstract. NASA Cloud Aerosol Lidar with Orthogonal Polarization (CALIOP) Version 3.01 5-km nighttime 0.532 μm aerosol optical depth (AOD) datasets from 2007 are screened, averaged and evaluated at 1° × resolution versus corresponding/co-incident 0.550 AOD derived using the US Navy Analysis Prediction System (NAAPS), featuring two-dimensional variational assimilation of quality-assured Moderate Resolution Imaging Spectroradiometer (MODIS) Multi-angle (MISR) AOD. In absence sunlight, since...
Abstract. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) version 4.10 (V4) level 2 aerosol data products, released in November 2016, include substantial improvements to the subtyping and lidar ratio selection algorithms. These are described along resulting changes optical depth (AOD). most fundamental change V4 products is a new algorithm identify subtypes stratosphere. Four introduced for stratospheric aerosols: polar (PSA), volcanic ash, sulfate/other, smoke. tropospheric...
Abstract. The accurate classification of aerosol types injected into the stratosphere is important to properly characterize their chemical and radiative impacts within Earth climate system. updated stratospheric subtyping algorithm used in version 4.5 (V4.5) release Cloud Aerosol Lidar with Orthogonal Polarization (CALIOP) level 2 data products now delivers more comprehensive classifications than its predecessor. original identified four subtypes for layers detected above tropopause:...
The authors report the generation of 1.2mJ pulses with a duration 5.6fs from neon filled hollow-core fiber seeded carrier-envelope phase stabilized 2.2mJ, 25fs pulses. after was measured by second, out-loop f-to-2f interferometer. With seed pulse power locked, two-cycle is controlled to standard deviation 370mrad. peak pulses, 0.2TW, twice that previously generated. significance energy stability for stabilization few-cycle laser demonstrated.
Abstract. Between June 2006 and September 2009, an instrumented light aircraft measured over 400 vertical profiles of aerosol trace gas properties eastern central Illinois. The primary objectives this program were to (1) measure the in situ determine their temporal variability (2) relate these measurements concurrent surface satellite measurements. profile location was within 15 km NOAA/ESRL monitoring station near Bondville, Identical instruments at on ensured that data from both platforms...
Abstract. The global aerosol extinction from the CALIOP space lidar was used to compute optical depth (AOD) over a 9-year period (2007–2015) and partitioned between boundary layer (BL) free troposphere (FT) using BL heights obtained ERA-Interim archive. results show that vertical distribution of AOD does not follow diurnal cycle but remains similar day night highlighting presence residual during night. FT contribute 69 31 %, respectively, tropospheric daytime in line with observations Aire...
For f-to-2f interferometers based on white-light generation in sapphire plates, the accuracy of carrier-envelope (CE) phase measurement and stabilization is affected by laser energy fluctuation. The coupling coefficient between CE has been determined modulating pulse an in-loop interferometer while measuring variation with out-loop interferometer. When total spectral measured was locked, a 1% change caused 160 mrad shift output pulses.